Reverse cycle valve



June 2, 1953 E.-F. KOUNOVSKY 2,640,494

REVERSE CYCLE VALVE Filed Jan. 9, 1947 2 Sheets-Sheet 1 4" /Z If /A/I)EA/ To 8 E0 WARD E Kou/vo 145/0;

Patented June 2, 1 953 UNITED STATES PATENT OFFICE 2,640,494 REVERSE CYCLE VALVE Edward F. Kounovsky, St. Louis, Mo.,assig'nor to Alco Valve Company, University City, Mo., a corporation of Missouri Y 7 Application January 9, 1947, Serial No. 720,956

11 Claims. (01. 137-601) The present invention relates to a reverse cycle valve. While this valve is' capable of various uses, its particular application is in connection with reverse cycle refrigeration apparatus in which there are two coils, either one of which may be an evaporator, while the other is a condenser.

The broad object of the valve-is to provide a satisfactory valve that may control which one of the two coils is the evaporator and which is the condenser, and which valve may reverse this order at will. e r v Another object is to provide a mechanism for interposition into a reverse type refrigeration system, or the like, wherein there is a high pressure inlet, a low pressure return, andselectable Work lines, With a main control, preferably a valve shiftable to connect either of the work lines with the return, and with a valve selectively operable to connect the other work line to the inlet and to cut off the one from the inlet, with lost-motion connections between the main control and the inlet valve that insure movement of the inlet valve upon movement of the main control, but may merely move the inlet valve sufficiently toward its other seat to enable the flow pressure drops to complete its seating. This ob ject includes that of eliminating the necessity of constructing a valve wherein the parts are made with that degree of accuracy required to insure joint seating of two Valves under a single, positive, mechanical, force applying means. It'further includes the objective of providing a second valve that will be mechanically forced 'to operate with the first control, but will not be mechanically operated throughout its complete cycle. I

A further object is to provide a valve that will enable the compressor to start up under greatly reduced load, and that will insure application of the load when the compressor is up to speed.

Further objects of-the invention include the provision of parts thatmay be'easily assembled from stock materials so-that the valve may be made. at .minimumcost. Further objectsinclude the provision of particularly desirable interconnections between the two valve elements of the device.

. Further objects'will appear from the description to follow. e

- In the drawings, wherein the dispositions of the mechanism are for purpose of convenience in description: 7 ,.Eig..1.is a. plan view of the mechanism partly broken awayg. Y 7

Fig. 2 is a verticalsection on the line 22;of

Fig. 3 is a vertical section on the line 3-3 of Fig, 2 and of Fig; 1;j- 4

Fig. 4 is a diagrammatic view of the refrigerating system'with the valveshown therein; and Fig, 5' is a modified form-of the invention. This invention constitutes a variant upon-the disclosure 'in application Serial -No. 674,052 of June '3, 1946, now Patent No. 2,4 Nov. '1. 1949, by Franklin M. MacDougall, and assigned to the assignee hereof. H

Referring particularly to-Fig; 4 at the outset, a refrigeration system is shown having a compressor ll]. This-compressor is connected into the valve of the present invention, which is generally indicated at llp 'lhereare two coils-j I2 and I3, and athermal expansionvalve M. g

The compressor m 1s connected by a high pressure line [6 into the valve ll. The valve ll is connected by a work line H to the coil 82, and. this coil is connected by a pipe it into one side of the thermal valve [4.

The valve I l is connected by a work line [9 into the coil l3, and the coil i3,-in turn, is con nected by a pipe 20' into the other side of the thermal valve 14. A return low pressure line-2i connects from the valve H back into the compressor ID. The thermal expansion, or thermo valve M, has a-thermal bulb 23 disposed adjacent the return line 2|, and an externalequalizer line 24 connected into the return line -2I. This is a conventional type of val I constant-superheat in the expansion coils. v The valve l I includes a first cup-shaped'housing or chamber 25; "I -he inlet line-i6 opens into the interior of'the chamber 251 This chamber may be formed from conventional tubular mate rial; It has an inturnedcircular flange 26, at one end that receives the end of -a tube or pipe 21, thatconstitutes one outlet'irom this'chamber. This tube is tapered on its end to provide a valve seat 28. Solder, orthe- 'like'ymay be, used to sealthe tube 21 intothe flange 25.

. The other end of the cup zs-is-epeh, but" is grooved to receivea union head towhich carries another pipe 3| to which it; is permanentlq, united. Thispipe constitutes; another outlet from the chamber 25, andhas a valve se at"'32 onits inner end. A union fitting/33 isthreadecl onto 'theexterior of the openendpf the cup 25 and is designed to engage thedisc 30 andi'fix the tube 3| into the cup 25.- t

A valve 35, that may Ice-referred to as an inlet valve, is adaptedto engage-with either seat 28 ve that maintains or 32. This valve is mounted on a valve stem 35 to which it is removably secured by a nut that engages over a threaded end on the stem 36. This stem is slidably guided in a pair of guides 39 and 40. These guides may be formed of cylindrical tubular parts having their center portions stamped inwardly at til to engage oppositely on the surface of the'valve-stem, -as describedin greater detail in the Macljougall' application.

The valve stem 35 is provided with a collar arrangement 42 intermediate its ends for a purpose that will appear.

The tube 27 is provided withani-upper-circular opening 44, and is hiterfitted'with-the end-of a 1 cross pipe 45. The pipe 45 has an inside diameter approximately equal to the outside diameterof the pipe 2?. A transverse cutoiitis made through the lower end of the pipe 45 from a center so'niewhat inward from the lgyver end of the pipe 45, as it appears in Fig. 2. The pipe-2'1 is fitted into this cutout, disposing the opening 44 to mommunicate into the connectingpipellfi, and the ends 46 of the cutout are swedged over and welded or soldered, as at 4'1, to; join these two pipes permanently together. Additional solderin or welding may be applied at-48to insure complete sealing. A g

The upper end of the; pipe liiis similarly cut out'to receive a pipe'SD, that 'is eut out to provide opposite openings and-52. The-pipe 5B is interfitted with the transverse cutout in the conmeeting-pipe 45, so that the opening-5l establishes communication between them. The upper ends of the pipe 45, produced by he transverse cutout, are then swedged over asat 531 and-the two-pipes are soldered or welded together as at 54.

The pi 59 interfits into the endof -a housing or chamber Bil that is preferablyidentical with the cup 25. The pipeiil has a valve seatiil on its inner end. The cup Bil-is grooved'at its open end to receive a plate 82 that is-welded-rto another pipe "63, and the plate 62, withthe'pipe 63, are removably secured to the cup by aunion ring "64. The pipe 83 has a-valve seat fiii on* its inner end. A cross pipe 65 connects the -pipes-3I 'and63. The two pipes 58 and 63 constituteinlets to the upper valve housing 69.

A main control valve head 67 is attached to a valve stem 68 by a nut 69. Thisvalve-stem reciprocates within the pipe 59 and is provided with a support 'IB similar to-thesupports 39 and ill. The outer end of the valve;stem 68 receives a bellows head 72 that is spldered or otherwise secured to the valve stem 58. Thebellows head has a bellows I3 thereon -that is permanently attached to a'cup I4 that is Welded orotherwise secured inside the end of the pipe This bellows seals on" the end of the pipe 58, but permits reciprocation of the valve stem=fi8.

The pipe 5i] is permanently attached-toa cap plate I6 that is bolted at- TI toa handle block it. This handle block has an internal bore lgextending inwardly therefrom to receivethe "valve stem 68. Within this bore, the valve stem is soldered, welded or otherwise secured to a' collar 80. This collar is adapted to be operated'by a handle shaft 8I having a handle -82 thereon. This'ha'n'dle shaft proiectsinwardly into the bore I9 and has an eccentricpin-iid on its inner end that engages with the collar 80. By this-means, rotation of the handle 82 will cause reciprocation of the valve stem'68. I

The valve stem 68 hasa small plate fifiwvelded or otherwise securedto its bottom surface. This 92 in =a sleeve-like supporting member 93 that is permanently secured tothe interior-ofthe pipe 45.

The lower ends of the lever 9% are likewise forked and hooked over, as at 94, to engag on opposite sides of the, collar 42 with lost motion. Th'us,itwill be seen that manual movement of the handle 'sz'not only shifts the main control 'valve'fii between the valve seats GI and 65, but,

"with the lost motion, likewise shifts the valve 35 toward and from the seats 32 and 28.

Inassembim the valve mechanism, the opening52 in the top of the pipe 5%} makes the linkage accessible. This opening is ultimately closed by a cover 98 that is soldered or welded at 97.

Aspreviously indicated, the inlet I6 "opens into the housing 25 at the back thereof in Fig. 2. {The work line I! is connected into the pipe 63. gThe work line I9 is connected from thepipeZ'I. The pipe M has its end plugged, as shown at 99. The return line 2I is connected into the housing 60, at the back in Fig. 2. n

A modified form of the valve isshown in Fig.5. Its operation is the same as that shown in-the previous drawings. It has certain constructional advantages, as will appear from its fulldescription. In it, the compressor discharge line I6 is shown, along with the compressor suction line 2 I, and the two work lines I? and I9 all as previously described. The compressor discharge line I6 leads into a cup-shaped housing :80. This housing has a shoulder IilI formed on its inner surface, and against this shoulder a partition Ill2'is located. A combination spacer-and port cylinder i533 engages onto the partition I82 and is stabilized by a cylindrical flange in'the partition I62 around the top part of a passage IM- therethrough. This passage Hi l terminates in a valve seat I535. The upper part of the-cylinder N33 is held by a screw cap closure {66 threaded into the top of the cup we and sealed therein. The outlet work line IQ leads from the cup I03 and communicates through the ports It? inthe cylinder The cup I00 has inturned flanges -on-one-end that receive aconnecting pipe II!) that has a valve seat III on its inner end, thisvalve seat being spaced from and opposite to the valve seat I05. The pipe H0 receives-the Work line I'I' entering thereinto. The other end of the'pipe- I I0 fits into a cup H2 that may be identical with the cup I913. The pipe III! has a valve seat'II3 within the cup I I2. The cup H2 receives-a partition ii i corresponding to the partition I82 and having a port H5 therethrough terminating in a valve seat i it. A cylinder I ll having ports I I8 engages the partition and-is heldby a cap H9.

' A pipe I20 connected with the work line I9 comscribed, and has a valve head I21 supported on it between the two valve seats I I3 and H6. The valve head I2! is secured in position by a threaded collar I28 that engages threads on the end of the stem I25. This threaded collar has a slot I29 in its upper end. This slot receives a pin I30 secured; into the end of an extension valve stem I3I. -By thismeans the valve stem I3I is caused to follow the movements of the valve stem I25, but with a lost motion. 'The valve stem extension I3I has a valve head I33 thereon for cooperation with the valveseats III andI85.

The valve may be manually operated. To this end,.there is a cap I35 that threads onto the end of the closure plug I22 and .maybesecured by setscrew I35. Within it slides a collar-I31 fixed to the stem I25, and this eollar may be actuated by a handle in the same manner that the collar 80 of the previous modification is operated; Operation t t-5.14, {the schematic diagrain'tf this valve. in

'an assembly, indicatestwo coils I2 and I3, either of which may. be used as ,a condenserat onetime and an evaporatorat another time, These two cells are joined throughlthe thermal valye ,M,

which is here shown as one having an external [equalizer 24 connected tothe suction. line of the compressor.

" At thestart, the handle82 willbeturned to dispose the main valve 61 against either the "valve seat GI ,or thevalve seat 65,. Fig.4 shows ithisrvalve 61 engaged firmly] with the valve 8821365. I,

The connection between the valve stem 68 and thejvalve stem 38 made through the link 98 causesthe' lower valve 35fto move oppositely to the movement of the valve 81. The linkage'is such as to assurethat the, inlet valve 35 will break from its seat upon shifting of the main controlvalve 61 from one seat to the other, and

further to insure that the inlet valve- 35 will be shifted far enough toward its other seat as to actual seating or the valve'as. 'This is a great I mechanical and structural advantage because the seating of two valves simultaneously offers constructional problems, owing to'the' accuracy of the mechanisms required to assure'complete and simultaneous seatin'g'of both valves. This situation is aggravated where each of the two valves in' question is required to seat on either of 'two seats.

If it be assumed that the valve 35 is at least as far toward the seat 28 as the midway point (and, under normal constructional conditions, it will actually be beyond the midpoint toward the seat 28) and the compressor is started, gas under pressure will be delivered to the valve 35. It will be ported by this valve pastthe seat 32 and into the :pipe 3|, thence. by way of the pipe 86, to the upper pipe 33. Its egress from thispipe to the left is prevented by the-seating of the main :con- .troLvalve-B'I in the seat 65. Hence,,any egress fromJthe pipe 63 musttakeplace around through -return totthe compressor.-

the line", the coil I2, and the line I8 up to the thermal valve. In the meanwhile, if the valve .35 is not quite seated upon the seat 28, the com- Owing to the fact that this a short-circuited now, and also owing to the fact that the valve 35 i s;normally disposed fairly close to the seat "28 there will be a considerable pressure drop across. the valve seat 23. The lost motion con- ,nection insures disposition of the valve 35 close enough to the seat 28 to produce this pressure drop and the attendant pressure differential on opposite sides of' the valve head, that urgesit toward the seatld It will be understood that theshortcircuit fiow is potentially considerably greater than the normal flow against the resistance of the coils I2 and theremainder oi -their associatednsystem. Consequently, .the pressure am -ac oss the valve seat 28 will begreat filhe result. of such pressure difierential will be to cause the valve 35 toseat firmly on, the seat 28,

breaking ,the short circuit. and forcing the high pressure gas topass around the valve seat 32. and "through the system, beginning with: thee-oil ,I 2. It will further be evident that,.when the valve 35 does seat, the full compressor pressurewillbe exerted on the. valve 35 .to holdit against its. seat 28, oppos'edyonly by return line pressure,

The high pressure gas passing throughthecoil ,I2 is condensed, owing to the fact that thiscoil is under the designated direction of gas flow. acting. as a condenser. The condensed fluidlpasses through the line I8 tothe thermal valve). 3 Beyond the thermal valye', the compressor .will be pullingalowpressure,onto the. pipe- 28. the coil I 3, the pipe I 9,. the systemthrough the valve byway of thepipef2l,,thepipe 45,.the upper pipe 58, the valve seat. 6], and the line 21, The low pressure condition will aid 7 the. opening .of the thermal. valve 14.; v The thermal valve acts as an expansion valve and delivers refrigerant to the lin '28 and tothe coil I 3,' whioh acts in this case as fan evaporator. The eoil I3 thusdraws heat from the surround.- ing, fluid medium-j The refrigerant, is thenv successively drawn as aforesaid through the main control valve, and bytheline 2I back to the eornpressor, 'ljhereisthus established a ref-rig.- statio 1 c le swear- 11 hea is t r w fro t e 11 5111 1 su ounding t 011 I3 a di de- ,livered n t hemed i su o i heicoi-l I2... It will bea sumed that the coil, I2. is outside th building orspacebeing conditioned; and the 0911,13 is inside. .T his meansthen that the space .ishe na g ed l v 1 1.

Ifthehandle 82 is operated to throwthevalve 51.;toi the left; away, from thetvalverseat 65 and against, the valve. seat'BI, the cycle willhere.- vers'ed; 1 Such movement of. the} valve 81 will, :th foughthe connection of the link between the two valve stems Bill-and 35, 'cause'the valve ;-35;..to bebrokenaway from itsseat 28 and to move to.- n 4 ld thejseat 32,fl.As aforesaid, the normal const r'u Qtion of the .,valve will dispose the valve. 35 e ond the mid-point toward the seat 32-.. Thereaiter whenlthecompressor I8 is starte'd the operation previously described will repeatg'itself, with however, thevalve 35 seating itself tightly against the seat 32-, and the direction o'iZflow proceeding oppositely so that the flow vpa'ssesthe salve imh ese i tq abeli g, wa s-am se ecto-494 the c'oil m, which riow acts asa condenser. The flow will pass from the coil [3 through-theline to-the th'ermal valve, w'hereat it will be expanded and pass ihto the line 18 'to the f coil 'l2, which new acts as an evaporator. From this ev'aporator coil t2, the refrigerant iiows through lithe line t! back into the valve '-at the pipe =33, whence it may flow past the valve seat 65 and back into the return line H to the compressor. Under these conditions, the coil ['3 will be delivering heat to the-surrounding medium and th'e coil t2 extracting heat from the surrounding medium. Thus,the coil 13 will actuallybe acting as ahea'ter for the space, rather than a cooler for the space.

The foregoing operation represents the conditionsthat maybeobtainedwith this'syste-m. It :was assumed-'thatthe change-over by'the handle 82 was made when the compressor was dormant 'and the pressure conditions were neutralized throughout-the system.

Howeven'the handle'fizmaybe operated when the compressor is running. 'If it be assumed that the valve 61 is against the seat-65 and the valve against the sea-i128, as shown in Fig. 4, the i coil 12 will-bethe'condenser and the coil '13 the evaporator. As already described, there will be 'hot-gas delivered through the control valve past the seat 32 and up to'the'coil '12. There will likewise be an "expanded refrigerant in the coil l3, as well as inthe two'pipe's 20 and I9, and the control valve in the pipe'z'l up'to the valve'35, 'thevertical pipe and the upper pipe 50. If the valve '6! is suddenly shifted during such conditions tothevalve'seattl ,the valve 35 must be moved. If this valve 35 is not moved, then the two valves willb'e seated to the left simultaneously and the lower valve 35 will be subjected on its inlet side to the hot gaspressure and on its/left side to the lower expanding refrigerant pressure. Ultimately, by virtue of leakages and the like, thesetwopressures may equalize. It will be noted that when the compressor is stopped the external equalizer line delivers return line pressure, now equal to evaporator pressure, be-

neath the conventional diaphragm on the thermal valve, so that this valve is normally closed, thus blocking the equalizing of pressures across the thermal valve, so that equalization must take place by leakage pastthe two valves 67 and 35.

In the copending application previously mentioned, this situation is avoided by the use of a particular thermal valve having check valves associated therewith, to facilitate the equalization of pressures across the thermal valve, despite the fact that it may otherwise tendto close. The present system avoids the necessity of such specialized thermal valve because the shifting of the valve 61 from one seat to the other is .ac- 'compa-nied'by a mechanical breaking-away of the valve 35 from whichever seat it was engaging. 'Thus, if the valve 61 is moved'from the valve seat 65, as shown in Fig. 4, to'the valve seat "6|, the'link-90, acting between the two valve stems,

fwill"break the valve 35 away from the seat'28,

despite the fact that the compressor pressure, acting to the right of this valve 35, may, "at such time, be considerably greater than the evaporator pressure acting to theleft of this'valve. Equalization then rapidly occurs, followed by reversal of the flow.

It will be seen that the 'connection afforded by-the linkt'flbetween the two'valve stems'need not be highly accurate, because it necessary only to'breakthe valve 35 away and-pemutit-to move at least far enough toward the opposite "seat to produce the pressure drop that wil1 com- =plete the seating. The'm'echanicail movement of the -val-ve 35, afforded by the construction shown, willpositi-velymove the valve 35 at'least as far as this mid-pointand-willpermit it to move all the way from themid point to the proper valve seat.

7 In other wordsy'avalve construction has been shown wherein equalizing may 'be readily and ouickly'obtained when-the main control valve is shiftetifmanually,even though the shifting takes placewhile the compressor is in operation. 'Also, "the "arrangement permits the inlet valve "35 to open "at rest conditions of the compressor, as where' high 'evaporatorpressures develop. When this occurs-the compressor can start under-shortcircuite d conditions, and some up to an operating speed before the valve 35 "recloses and puts the fullloadon it.

The connections of the valve shown in Fig. 5 are as indicated thereon, and they are made with 'the alssenilily diagrammatically illustrated in Fig. '4. 'With .th'e'valvesin th'epo'sition shown inFig. "'5,th'e 'il'o'w' will be in -the "same direction as it is "in 4. "When the stem [25 'is shifted 'leftwardly manually, the valve [21 will be shifted from the seat H3 to the seat H6. The valve 133 will be positively broken from 'its'valve seat [05. The engagement of the pin I30 at the right end of the slot-129 will cause the valve I33 to be positively broken away from the valve seat "15 and moved over toward the'valve seat Ill. Thereafter, the flow pattern previously described in connection with Fig. 4 will cause the valve I33 to move into engagement with th'e'valve seat l H. In other words, the modification of Fig. '5 preservesthe operative characteristics of Fig. '4, ineludingthe.lost-motion,1but it does so with certain structural and manufacturing advantages. "-It reduces the number o'fbrazed joints and eliminatesan alignment problem that is present in the two discs .30 and '62 of Fig. 2, which are ,permanently attached together. It contains .fewer separable .parts, and also requires lessspace. It may becon-veniently serviced by the removal of the end plugs I06 and [22. When they are removed, the elements may be withdrawn. First, the )parts down to the partition 402 are withdrawn, whereupon the valve head I33 'can be removed. Thereafter, the elements down to the partition 144 may be withdrawn, and with them the valve 1-2.! up through the valve stem extension 4 3 I-.

What is claimed is:

:1. ,In a valve mechanism, a housing, a. high :pressure inlet therein, a low pressure outlet, a .first work outlet, a second work outlet, a main "control valve movable to selectively connect one 'of the work-outlets with the .low pressure outlet and to cut off the 'other :from the low pressure :outlet, a second valve, a :pair of spaced valve seats therefor, said second valve being movable between the said valve seats to connect one of the "work 'outlets with the inlet and to out off the other "work outlet from the inlet, means to move said main valve, and los't motion connections between the said moving means and the second valve, to cause said second valve to :move when the chain valve is moved.

-2 In a valve mechanism, a housing, :a high pressure inlet therein, a low pressure outlet, a "first work outlet, fa second work outlet, a main control valve movable to selectively connect one :of the W0rk 0l1tlts with the low pressure outlet and to out on the other from the low pressure connections between the said moving means and the second valve, to cause said second valve to move when the main valve is moved, said lostmotion connections being constructed to insure member, a tubular connecting element connected breaking of the said second valve from the seat with which it is engaged when said-main valve is moved to change the connections, of, the work lines and the low pressure outlet. v 3. In a valve mechanism, a housing, a'high pressure inlettherein, a low pressureoutleta" first work outlet, a second work outlet, a main 3 to cut ofi the other work outlet from the inlet,

means to move said main valve, and lost-motion connections betweenthe said moving means and the second valve to cause said second valve to movewhen the main valveis moved, said lostmotion connection being constructed to efiect Y displacement of the said second valve from its seat and-to move the same into flow constricting Y relationshipwith the second valve seat when-the moving means shifts the main valve.

4. In a valve mechanism, a housing, a high pressure inlet the a low pressure outlet, 2. first work outlet, asecond work outlet, a main control valve movableto selectively-connect one of the work outlets with the low pressure outletand to cut off the other from the-"low pressure outlet, and vice versa, a second valve, a pair of spaced valve seats therefor, said second valve being movable between the said valve seats to connect one .of the work outlets with the inlet and to out 01f the other work outlet from the inlet, means to move said main valve, lost-motion connections between the said moving means and the second valve to cause said second valve to move when the main valve is moved, said connections comprising a link means, a valve stem for the main valve, a valve stem for the second valve, and lost-motion connections between the link means and at least one of said valve stems.

5. In a valve mechanism, a housing, a high pressure inlet therein, a low pressure outlet, a first work outlet, a second work outlet, a main control valve movable to selectively connect one of the work outlets with the low pressure outlet and to cut off the other from the low pressure outlet, a second valve, a pair of spaced valve seats therefor, said second valve being movable between the said valve seats to connect one of the work outlets with the inlet and to cut off the other work outlet from the inlet, means tomove said main valve, and lost-motion connections between the said moving means and the second valve to cause said second valve to move when the main valve is moved, said lost-motion connections being constructed to cause the said second valve to move at least half wai from one of its positions to the other upon movement of said main valve from one of its positions to the other.

6. In a valve construction, a first valve housing having inlet means and outlet means and a valve controlling flow therebetween, a tubular member connected with the housing, a valve opcrating member in the tubular member and movable therein, a second valve housing having inlet means and outlet means and a second valvecontrolling flow therebetween, a second tubular member connected to the second housing, a second valve operating member in the second tubular between said tubular members, a link disposed in the connecting element, means pivotally mounting the link in the element, means connecting the link with the valve stems with a lost motion, and means for-positively operating one of said valves whereby movement of the other valve is eiiected through resulting movement of the lost motion linkage independently of said positive operating means.

'7. In a 'valve construction, a first valve housing having inlet means and outlet means and a valve controlling flow therebetween, a-tubular mem-' ber connectedwith the housing, a valve operating member in the tubular member and movable therein, a second valve housing having inlet means and outlet means and a second valve controlling fiow therebetween, a second tubular member connected to the second housing, a second valve operating member inthe second tubular member, a tubular connecting element connected between said tubular'members, and a link disposed in-the connecting element, means pivotally mounting the linkin' the element, the link pro-- jectingat one end to one valve stem and at the other end to the other valve stem, abutment means on each valve-stemto transmit move-.v

ments between the stem and the link, at least one abutment mean including-1a .pair of .abutments.

spaced alongthe valve stem for engagementwith the link,.and spaced along the link a greater. distance apart thanthe corresponding dimension of the link, to provide a lost-motion connection.

8. A reverse cyclegreirigeration ;,va1ve ioruse with a compressor, a high pressure line, a return v line, a pair of coils,.-a thermal expansion valve the 11 "l 5-; QQR W W .=.qne s=ted -t e thermal valve, and a pair of Work lines one leading to each coil, comprising the combination of a valve housing having a first valve chamber, an inletinto said chamber for connection with the high pressure line, opposed outlets leading from said chamber, having opposed valve seats, each outlet being adapted for connection with a work line, a second valve housing having a second valve chamber with an outlet for connection with the return line, the chamber having opposed inlets and opposed valve seats, each inlet being connected with an outlet from the first valve chamber, the first valve being selectively movable to each valve seat in said chamber, a second valve in the second valve chamber and selectively movable to each valve seat therein, means to move the second valve from one seat to the other to connect one of the inlets of the second chamber to the return line and to cut the other from the return line, and connections between the two valves to cause the first valve simultaneously to move toward position to open the inlet of the second chamber cut off by the second valve responsive to said second valve moving means, to the high pressure inlet and to cut oh the inlet of the second chamber opened by the second valve, from the high pressure inlet.

9. A reverse cycle refrigeration valve for use connected with an outlet from the first valve chamber, a first valve in the first valve chamber, the first valve being selectively movable to each valve seat in said chamber, a second valve inv the second valve, charnbcn and selectively movable to each valve seat therein, means to move the second valve from one seat to the other to connect one ofthe inlets of the second chamber to the return line and to, out the other oil from the return linaand connections between the two valves. to cause the first Valve. sirnultaneously to move toward; position to open the inlet of the second chamber cut 0ftby the second valve re- 0 sponsive to said second valve moving means, to the high pressure inlet and to out 01f the inlet of the second chamber opened" by the second valve, from. thehigh pressure inlet, said connections including-a lost-motion device.

10. A valve construction including afirst valve mechanism having a first valve housing, a removable closure thereon, a first tubular element extending into the housing opposite the closure and having a first valve seat at the end thereof, a second tubular element secured to the closure, projecting into the housing and having. a second valve seatat its end, disposed in opposition to the first valveseat, a second valve mechanism of like construction, means connecting the corresponding tubular elements of the two mechanisms, a first valve in the first housing movable between the twoseats, a stem therefor projectinginto one tubular element, a second valve in the second housing movable between its two seats, a second 12?. m. h r q n ie in .1 9 e t la lement, corresponding to the first stem, linkage means in a connecting means between the two tubular elements, said linkage means joining the two stems. for conjoint movement of the 'two valves, and handle means connected with one tubular element for moving one valve stern.

eva ve e han m i n ahqu ine having a high pressure inlet, alow pressure outlet, afirstwork outlet,and,a second work outlet; a firstcontrol valve movable between a first set of valve seats to selectively connect one. of the worlg outlets with, the low pressure outlet; asecr. 0nd valve movable between, a second,v set of valve seatstoselectively connect one of the work. outlets with the inlet; means tomove said-first, valve from one valve seatto theother; and means in terconnecting the valvesto move the second valve from one valve seat towardthe other valveseat ,but not into closure therewith when said one valve. ismoved from one seat. to, the other, said interconnecting means including means. permit ting limitedmovementof said second. valve, rela.-, tive thereto so as toopermit, it tomove toclosure withsaidsecond valveseat due. tothe difference inpressurecaused by, the flow of fluidthroughthe valve mechanism.

EDWARDF. KOUNOVSKY. 

